Is it possible to take an Android firmware snapshot?

I am currently working for a company that operates screens in some kind of 'kiosk mode' to provide information in malls etc. The devices are basically big monitors connected to a development board (as far as I can see similar to a Raspberry Pi) which runs Android and starts a display app when boot up. Now the problem is that we currently have to set up all the boards manually. Meaning removing certain pre-installed vendor apps, installing our own apps, setting the right configuration, etc. Since this process is quite time-consuming and prone to errors, we thought if there is a solution to configure one device, save the "firmware" (.img) on a computer or USB stick and then use this image as a base for all other devices. Is there an easy way to achieve this? How can we create a snapshot of the Android device? All devices are the same from a hardware point.